Perhaps you should try some spelling variations:
thanh trung » thanh tung
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (doi chieu)) tinh - thanh trung cua dung ((cong ban) OR (cong tan)) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (doi chieu)) tinh - thanh trung cua dung ((cong ban) OR (cong tan)) than cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (doi chieu)) tinh - thanh trung cua dung ((cong ban) OR (cong tan)) than cau*.